Material Name: Alloy Steel
Grade: 30Cr
Standard: GB / T 3077-1988
● Features and application:
Compared with 30 steel, strength and hardenability are high, this steel is usually used in the quenched state, can also be used after normalizing. For wear and a great impact on the work load of the important parts such as shafts, small axes, balance levers, rocker, rod, bolts, nuts, gears, and a variety of roller, etc.; can also be used subject to surface hardened parts.
● Chemical Composition:
Carbon C: 0.27 ~ 0.34
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.50 ~ 0.80
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.80 ~ 1.10
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 885 (90)
Yield strength σs (MPa): ≥ 685 (70)
Elongation δ5 (%): ≥ 11
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Hardness: ≤ 187HB
Sample size: Sample size is 25mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 860 ℃, oil cooling; tempering 500 ℃, water-cooled, oil-cooling.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.